I had a Trek 1000 when I weighed more than you and it worked fine.
OC I have a 2005 CAAD R1000 wheels and I way 50lbs more than you right now and its working good. Just BE CAREFUL. No curb hopping, no high speed cobblestone racing. I am aiming to get down to were you are now in a year.
I have had a lot of luck with "midsize" bike shops and shops that cater to women. They are better at listening than mega stores or small shops sometimes. Talk to someone who rides road bikes. A mountain biker wont know what you are looking for.
I generally wont buy a bike without riding it, unless I am sure I will like it. (like I have ridden a similar model in the past)
Good luck.